How do i open a new JPanel on mouse click

i'm trying to make the program open a new JPanel when i click on a button in the main JPanel.
how do i do this?

regarding that example given ( [CardLayoutDemo.java|http://java.sun.com/docs/books/tutorial/uiswing/examples/layout/CardLayoutDemoProject/src/layout/CardLayoutDemo.java] )
when i add buttons/text fields, and/or new JPanels, the changes are not reflected when i compile and run it. other than the title of the JFrame.
oh, never mind. it is because of a one liner stupid mistake.

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How do i open a new JPanel on mouse click

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